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LQDCCMETASSLGN@ mo rum-nn NAELQR ,rottenniemand l Letters Patent No.`12,7710, 4dated prima 1855.

Zaanwhom,amayeaem a i 1 Bejitknownyithat "Joran lGoMsfrocK, of

Glane :that the` followingais alflullyclear, and

eziactyfdescrilptiony';ofi` the-constnuction and operation ofthe same,reference4 being had toflthe lanneiredldirawing, making par-t `of this y,l speciication,\wheren-` m i fFigureflyisiaplan, Fig.j2, isasideeleva-,

tion, Fig1 3 isanfelevation atgithe end A, and

Fig; il, is any elevation lat the end `B, colflectively showing f l y pimproved forging hammer as ready "for use.` f

same *part-s; l 1

The nature of mysaidinventionconsists 1 in so"` applying a loose `beltwith cams and otherparts, that aforginglhammer `can be brought-tostrikeheavybor light `blows to finish work,` or the` hammer be entirely"stopped,` although `the power which drives p "thefpafrts continuesitsinotion; thus placing "the attendantfin possession of facilities forcausing the power tostrile the blow desired, throughfthe interventionfof simple mechanical 1neans.`

@,ls a pulley on a` shaft 1, supported in suitable bearings, :towhichacontinuous roi tation isi given by `competent power; a loose belt 2,passes fromcthe pulley a, around a pulley 7), on a shaft 5,"set \inbearings 3, 3;

and nearthe end ofthisushaft o, a fly wheel `(his attached so as tocauseasteady rotation of theshafthc.` fil l i y y e, `is apulleyhungon-aframe 4, moving on centers 5, `which when brought against thebelt 2, tightens the sameon its pulleys;

`1 this tightener is drawn back from the belt; by a spring 6, when notacted on by a rod 7,

to a right anglelevergylon a fulcrumw?, to

the end 8, of which leverfg, the foot of the operatorie applied to tighf 1 the belt 2, and 1 causethe shaft c to be rotated.V

` "Whenit is desired to stop the revolutions ofthe shaftc, the operatorremoves his foot from the end 8 ofythe lever, and allows the spring 6todraw baclrthe tightening p-ulley,

New `London and ave invented;` and denote the :break lblook 11, isAattached .as shown in Fig. `3, thus` :thelrevolutions of the shaft c,are

`entirely under the control fof the operator for when :butta lightpressure isgiven to the tightening pulley the belt `2 will ,partially islip thrus the speed can be :regulated or the shaft c, stopped. l

C, `iis the -bed ofthe forging hammer sup portedon suitable foundationsV'cir-.iewith the dieron the hammer :if required;

`at `the .other 4end of the ,bed short standards slettsin the standards`finto ,a plate17.,-b,y `thlsmeans the frame 0., and hammer :can be:raised for lowered ,as desired.

18, 18, `are `center screws passing `through the'frame lo,` into the-ends of the ,ham-mer tnunnions p, to which the slings cer handle g ofthe hammer r, are attached and s, is the movable face or die of thehammer.`

o, is a cross piece between the slings g, to

which a bar 22, and screw shackle are at-V tached connecting the same toa spring pole or any similar means for lifting the hammer `to therequired height; the screw shackle affording a means for so doing, withgreat accuracy.

t 1s a cross y m, Jlsthe forging block or \@lie,whiclimay 3be1ma'deadjustable las usual, .so as to ooinbar over the slings g, attached to`them in any `suitable manner Vso that it can be moved if desired nearerto, or farther from the trunnions p, so as to vary the leverage on thehammer. To this cross bar t, a rod 19 is connected that passes down tothe screw shackle 20, which connects to the horizontal lever 11(see Fig.3) that is jointed at 21, by a fulcrum on the foundation D, and theother end passes across beneath the shafts. a j

On the shaft` c, over thelever u, cams z', and 1, are fitted either toslide on a square part of theshaft'or on a key, and 12, is a forkpassing1 into a neck between said cams; this fork ison the end of a rodZ, running to a bent lever 13, the horizontal arm of which terminatesasa stud 15, passing through a hole inthe footfpiece;`

14 is a contractile spring which unless ,otherwise acted onkeepstheflongest camz' over the lever u. y l

It will now be apparentthat the operation of these parts is, that whenthe attendant presses down the end 8 of the lever g" the hammer "ismoved with a speed proportioned to the tightness of the belt 2 the camz', by its length giving a heavy blow; the force of which blow canberegulated by the screw shackle 20, and the spring fw, lifts the hammeragain each blow; and when the forging is nearly complete or requires butslight blows the workman presses down the end 15 of the lever 13, whichslides the cams i and il, along on the shaft c, bringing the cam 1, intooperation, which being shorter does not strike so hard a blow but onesuited for finishing the forging.

I do not claim a tightening pulley in itself as this is well known, butI am not aware that a tightening pulley and break have ever before beenused as herein set forth, by which the speed of the blow is regulated bythe tightness of the belt or the same is stopped entirely by the break,while the motive power still propels the belt. And I am well aware thata hammer has been so set as to be drawn down to give the blow and thenraised again by a spring, therefore I do not claim the same in itself,and I am also well aware that different sized cams have been used forraising a forging hammer therefore I do not claim the different lengthsof cams in thelnselves, but I am not aware that two or more cams ofvarying lengths have ever before been combined with a lever andadjustable screw schackle to pull down a hammer and give the blow,whereby I am enabled to use a definite amount of motion given by a cam,to forge articles of vario-us sizes, the screw shackle giving thefacility for regulating the point to which the hammer is pulled.

Therefore what I desire to secure by Letters Patent is- 1. I claim themethod herein described and shown for regulating the speed of the blowsgiven by a forging hammer, by the use of a tightening pulley combinedwith the break applied to the iiy wheel substantially as specified.

2. I claim the method herein described and shown of regulating theamount which a hammer is drawn down to give the blow by rotating cams,by combining with said cams and hammer the adjustable screw shackle 20,and lever u, the whole constructed and combined substantially asspecified.

In witness whereof I have hereunto set my signature this twenty-eighthday of February, 1855.

JOHN COMSTOCK.

Witnesses:

H. W. LANPHER,

LEMUEL W. SERRELL.

